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This is the master POM file for Sun's Implementation of the JSF 2.1 Specification.

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package javax.faces.view.facelets;


/**
 * 

The root class of the abstraction that * dictates how attributes on a markup element in a Facelets VDL page * are wired to the JSF API object instance associated with that * element. The single method on this interface, {@link #applyRule}, * returns an encapsulation of the behavior that actually does the work * of handling the attribute and its value. There are implementations of * specific concrete subclasses of this class for all the basic kinds of * elements that appear in Facelets VDL pages: components, * non-components, and attached objects.

* *
*

For example, consider this markup:

<h:inputText value="#{user.userid}" 
                valueChangeListener="#{user.newUserId}" />
* Two MetaRule instances are involved in this example.

*
    * *
  1. The first has * an applyRule() method that returns a {@link Metadata} * instance that, when its applyMetada() method is called, * dictates how the "value" attribute is processed: calling {@link * javax.faces.component.UIComponent#setValueExpression} on the * UIComponent instance associated with the * <h:inputText> element.

  2. *
  3. The second has an applyRule() method that returns * a {@link Metadata} instance that, when its * applyMetadata() method is called, dictates how the * "valueChangeListener" attribute is processed: calling {@link * javax.faces.component.EditableValueHolder#addValueChangeListener}.

  4. *
*
* * @since 2.0 */ public abstract class MetaRule { /** *

Return an abstraction that takes * appropriate action given the kind of rule represented by the * argument name, in the context of this particular * concrete subclass of MetaRule. The abstraction must * encapsulate the value from the argument * attribute.

* @since 2.0 * @param name the name for this rule. This will generally be the * name of a tag attribute in the VDL. * @param attribute the name/value pair for this attribute on this * particular instance of an element in the page. * @param meta the MetadataTarged that can be used to * discern what kind of action to encapsulate within the abstraction * to be returned. */ public abstract Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta); }




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